CN216112428U - Electromagnetic valve and air conditioning system with same - Google Patents
Electromagnetic valve and air conditioning system with same Download PDFInfo
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- CN216112428U CN216112428U CN202122837546.0U CN202122837546U CN216112428U CN 216112428 U CN216112428 U CN 216112428U CN 202122837546 U CN202122837546 U CN 202122837546U CN 216112428 U CN216112428 U CN 216112428U
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Abstract
The utility model relates to the field of valve devices, in particular to an electromagnetic valve and an air conditioning system with the same. The electromagnetic valve comprises a valve body and a piston, wherein a valve port is arranged on the valve body, a first spring is connected between the piston and the valve port, two ends of the first spring are respectively sleeved on the piston and the valve port, and the length of the guide section sleeved by the first spring is L1The length of the first spring sleeve at the valve port is L2The total length of the first spring in the fully compressed state is L4(ii) a The total length of the first spring is L when the piston is at the upper limit movement position3And L is1、L2、L3And L4The following relation is satisfied: l is3‑L1＜L4And are and/or, L3‑L2＜L4. The utility model also provides an air conditioning system which comprises the electromagnetic valve. Compared with the prior art, the utility model has the advantages that: when the electromagnetic valve is in a valve opening state, the first spring is pushed to the middle of the valve port part due to the impact of refrigerant, and therefore the first spring is clamped in the middle of the valve port part when the valve is closed, and the problem that the valve is closed badly is avoided.
Description
Technical Field
The utility model relates to the field of valve devices, in particular to an electromagnetic valve and an air conditioning system with the same.
Background
The electromagnetic valve is an electromagnetic control component and is used in an industrial control system to control the on-off of a medium or adjust parameters such as the flow direction and the flow rate of the medium, so that the expected control is realized.
In the existing electromagnetic valve, because the elastic force of the first spring connected between the piston and the valve port is too large, when the electromagnetic valve is opened, the first spring is transversely pushed to the middle of the valve port due to the impact of refrigerant, so that the first spring is clamped in the middle of the valve port when the valve is closed, and the problem of poor valve closing is caused.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a solenoid valve.
In order to solve the technical problems, the utility model provides the following technical scheme:
a solenoid valve comprises a valve body and a piston, wherein a valve port is arranged on the valve body, and the piston can move along the axial direction of the valve body and is abutted against the valve port; the piston comprises a guide section, one end of the first spring, which is close to the piston, is connected to the guide section, and the length of the guide section is L as the first spring is sleeved on the guide section1The length of the first spring sleeve at the valve opening part is L2And the total length of the first spring in a complete pressing state is L4(ii) a The total length of the first spring is L when the piston is at the upper limit movement position3And L is1、L2、L3And L4The following relation is satisfied: l is3-L1＜L4And/or, L3-L2＜L4。
It can be understood that the present application provides by making L1、L2、L3And L4Satisfy the relation L3-L1＜L4And/or, L3-L2＜L4Thereby avoiding the electromagnetic valve from being opened when the electromagnetic valve is in an open stateWhen the electromagnetic valve is closed, the first spring is clamped in the middle of the valve port part, so that poor valve closing is caused.
In one embodiment, the valve mouth part is arranged at a height H along the axial direction of the valve body1And H is1The following relation is satisfied: h1＝1.8mm-2.4mm。
It can be understood that the valve port is set to a height H1Satisfy the relation H11.8mm-2.4mm, so that the height of the valve port part is increased to block the trend of the first spring moving towards the middle of the valve port part, and the poor valve closing is avoided.
In one embodiment, the guide section is arranged at a height H along the axial direction of the valve body2And H is2The following relation is satisfied: h2＝1.5mm-2.2mm。
It will be appreciated that by providing the guide sections with a set height H2Satisfy the relation H21.8mm-2.4mm, so that the height of the guide section is increased to reduce the distance between the piston and the valve opening part when the valve is opened, and the trend that the first spring moves towards the middle of the valve opening part is blocked, and the poor valve closing is avoided.
In one embodiment, the first spring includes a first connection section connected to the guide section, and the first connection section is pressed and disposed.
It can be understood that, by pressing and arranging the first connecting section, the elasticity of the first spring is further reduced, the rigidity of the first spring is increased, and the trend that the first spring moves towards the middle of the valve opening part is blocked, so that poor valve closing is avoided.
In one embodiment, the first spring includes a second connection section connected to the valve port portion, and the second connection section is pressed and disposed.
It can be understood that, by pressing and arranging the second connecting section, the elasticity of the first spring is further reduced, the rigidity of the first spring is increased, and the tendency of the first spring to move towards the middle of the valve opening part is further resisted, so that poor valve closing is avoided.
In one embodiment, the effective number of turns of the first spring is N, and N satisfies the following relation: n-2-4 turns.
It can be understood that N satisfies the relation N-2-4 circles, so that the elasticity of the first spring is further reduced, the stiffness of the first spring is increased, and the tendency of the first spring to move towards the middle of the valve opening portion is blocked, thereby avoiding poor valve closing.
In one embodiment, a first connecting pipe and a second connecting pipe are connected to the valve body, the axis of the first connecting pipe is perpendicular to the axis of the valve body, the first connecting pipe is connected to the side of the valve body, the second connecting pipe extends along the axis of the valve body, and the second connecting pipe is connected to the end of the valve body; the first adapter tube and the second adapter tube communicate with each other as the piston is disengaged from the valve port portion.
In one embodiment, the solenoid valve further comprises a sleeve and a movable iron core assembly, the sleeve is hermetically mounted at one end of the valve body, which is far away from the second connecting pipe, the movable iron core assembly is arranged in the sleeve, and the movable iron core assembly can move in the sleeve along the axial direction of the valve body; and one end of the piston, which is close to the movable iron core assembly, is provided with a guide valve port, and the movable iron core assembly can move towards the guide valve port and is abutted against the guide valve port.
In one embodiment, the solenoid valve further comprises a control assembly, the control assembly comprises a coil, a static iron core and a second spring, the coil is installed outside the sleeve, the static iron core and the second spring are both arranged in the sleeve, the static iron core is fixed at one end, away from the valve body, of the sleeve, one end of the second spring abuts against the static iron core, and the other end of the second spring abuts against the movable iron core assembly; the movable iron core assembly can move towards the direction close to the static iron core under the control of the coil, and can move towards the direction far away from the static iron core under the action of elastic force of the second spring.
The utility model also provides a technical scheme that:
an air conditioning system includes a solenoid valve.
Compared with the prior art, the method has the advantages that L is enabled1、L2、L3And L4Satisfy the relation L3-L1＜L4And/or, L3-L2＜L4Therefore, when the electromagnetic valve is in an open state, the first spring is pushed to the middle of the valve opening part due to refrigerant impact, and further the electromagnetic valve is closed, the first spring is clamped in the middle of the valve opening part, and poor valve closing is avoided.
Drawings
FIG. 1 is a schematic structural view of an electromagnetic valve according to the present invention in an open state;
FIG. 2 is a schematic structural view of a closed state of the solenoid valve provided by the present invention;
FIG. 3 is a schematic diagram of a free-state structure of a first spring according to the present invention;
fig. 4 is a structural schematic diagram of a fully compressed state of the first spring provided by the present invention.
The symbols in the drawings represent the following meanings:
100. an electromagnetic valve; 10. a valve body; 11. a valve port portion; 111. a main valve port; 12. a first adapter tube; 13. a second adapter tube; 20. a piston; 21. a guide section; 22. a valve guide port; 23. a balance hole; 30. a first spring; 31. a first connection section; 32. a second connection section; 40. a sleeve; 41. a movable iron core assembly; 411. a movable iron core; 412. a pilot valve core; 50. a control component; 51. a stationary iron core; 52. a second spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 4, the solenoid valve 100 is an electromagnetic controlled industrial device, is an automatic basic element for controlling fluid, and belongs to an actuator, and is not limited to the fields of hydraulic pressure, pneumatic pressure, and the like. The solenoid valve 100 is used in an industrial control system to regulate the direction, flow, velocity, and other parameters of a medium. The solenoid valve 100 can be matched with different circuits to realize the expected control, and the precision and flexibility of the control can be ensured.
In the existing electromagnetic valve, because the elastic force of the first spring connected between the piston and the valve port is too large, when the electromagnetic valve is opened, the first spring is transversely pushed to the middle of the valve port due to the impact of refrigerant, so that the first spring is clamped in the middle of the valve port when the valve is closed, and the problem of poor valve closing is caused.
In order to solve the problems existing in the prior electromagnetic valve, the utility model disclosesThe electromagnetic valve 100 comprises a valve body 10 and a piston 20, wherein the valve body 10 is provided with a valve port part 11, and the piston 20 can move along the axial direction of the valve body 10 and abuts against the valve port part 11; the piston 20 includes a guiding section 21, one end of the first spring 30 close to the piston 20 is connected to the guiding section 21, and the length of the guiding section 21 covered by the first spring 30 is L1The length of the first spring 30 sleeved on the valve port 11 is L2The total length of the first spring 30 in the fully compressed state is L4(ii) a The first spring 30 has a total length L when the piston 20 is at the upper limit movement position3And L is1、L2、L3And L4The following relation is satisfied: l is3-L1＜L4And/or, L3-L2＜L4。
Note that, by making L1、L2、L3And L4Satisfy the relation L3-L1＜L4And/or, L3-L2＜L4Therefore, when the electromagnetic valve 100 is in the open state, the first spring 30 is pushed to the middle of the valve port 11 due to the impact of the refrigerant, and further the electromagnetic valve 100 is closed, the first spring 30 is clamped in the middle of the valve port 11, and the valve closing failure is avoided.
It should be noted that the upper limit movement position of the piston 20 means that the piston 20 is already abutted against the position where the upward movement cannot be continued when moving upward in the valve body 10, and the solenoid valve 100 is in the open state, and the first spring 30 is in the maximum extension state of the piston 20 at the upper limit movement position, and the length of the first spring 30 is L at this time3。
In order to avoid the valve closing failure caused by the first spring 30 being pushed to the middle of the valve port 11 by the impact force of the high-pressure refrigerant, it is necessary to reduce the elastic force of the first spring 30 as much as possible and increase the stiffness of the first spring 30 when the length of the first spring 30 is designed. Since the first spring 30 does not have any elastic force when it is in the fully compressed state, L will be decreased1、L2、L3And L4Satisfy the relation L3-L1＜L4And/or, L3-L2＜L4The stiffness of the first spring 30 can be increased to reduce the tendency of the first spring 30 to move laterally.
Specifically, the parallel state of the first spring 30 refers to a state in which the first spring 30 is completely parallel when two opposing forces are applied to both ends of the first spring 30, the first spring 30 is continuously compressed, and the first spring 30 is compressed to the limit compression state of the first spring 30.
As shown in fig. 1 and 2, the solenoid valve 100 includes a sleeve 40, a control assembly 50, a plunger assembly 41, a piston 20, and a valve body 10. The sealed one end of installing in valve body 10 of sleeve pipe 40, control assembly 50 include coil, quiet iron core 51 and second spring 52, and the coil is installed outside sleeve pipe 40, and quiet iron core 51 and second spring 52 all set up in sleeve pipe 40, and quiet iron core 51 is fixed in sleeve pipe 40 and keeps away from valve body 10 one end. When the coil is electrified, the movable iron core assembly 41 can be attracted by the fixed iron core 51 and move towards the direction of the fixed iron core 51; when the coil is de-energized, the movable core assembly 41 moves away from the stationary core 51 urged by the restoring force of the second spring 52.
The plunger assembly 41 is at least partially mounted within the sleeve 40, and the plunger assembly 41 is mounted to an end of the sleeve 40 remote from the stationary core 51. The plunger assembly 41 includes a plunger 411 and a pilot shaft 412. The guide valve core 412 is fixed at one end of the movable iron core 411, which is far away from the stationary iron core 51, through riveting, and the movable iron core 411 can axially move along the inner wall of the sleeve 40 and can drive the guide valve core 412 to axially move. One end of the second spring 52 abuts against the stationary iron core 51, and the other end abuts against the movable iron core 411; the movable iron core assembly 41 can move towards a direction close to the fixed iron core 51 under the control of the coil, and can move towards a direction away from the fixed iron core 51 under the elastic force of the second spring 52.
The piston 20 is installed in the valve body 10, a main valve port 111 is opened on the valve port 11, and the piston 20 can move along the axial direction of the valve body 10 and is sealed at the main valve port 111. The end of the piston 20 away from the valve port 11 is opened with a pilot valve port 22, and the movable iron core 411 can drive the pilot valve core 412 to move towards the pilot valve port 22 and block the pilot valve port 22.
A first connecting pipe 12 and a second connecting pipe 13 are connected to the valve body 10, the axis of the first connecting pipe 12 is perpendicular to the axis of the valve body 10, the first connecting pipe 12 is connected to the side of the valve body 10, the second connecting pipe 13 extends along the axis of the valve body 10, and the second connecting pipe 13 is connected to the end of the valve body 10 far away from one end of the sleeve 40; the first nipple 12 and the second nipple 13 can communicate with each other as the piston 20 is separated from the valve port portion 11.
When the coil is energized, the movable iron core 411 moves towards the stationary iron core 51 under the attraction of the stationary iron core 51, and compresses the second spring 52 to be attached to the stationary iron core 51, at this time, the pilot valve core 412 is separated from the pilot valve port 22 under the driving of the movable iron core 411, the pilot valve port 22 is opened, at this time, the pilot valve port 22 is communicated with the main valve port 111 to realize pressure relief, when high-pressure refrigerant flows in from the second connecting pipe 13, the piston 20 can open the main valve port 111 only by overcoming the self gravity and the elastic force of the first spring 30, and the high-pressure refrigerant flows out from the first connecting pipe 12 through the main valve port 111.
When the coil is de-energized, the movable iron core 411 moves towards the direction away from the static iron core 51 under the pushing force of the second spring 52 until the pilot valve core 412 abuts against and blocks the pilot valve port 22. The piston 20 is further provided with a balance hole 23 communicated with the first connecting pipe 12, the high-pressure refrigerant in the first connecting pipe 12 flows into one end, far away from the main valve port 111, of the piston 20 through the balance hole 23, and because the force-bearing area of one end, far away from the main valve port 111, of the piston 20 is larger than that of one end, close to the main valve port 111, of the piston 20, the pressure at the upper end of the piston 20 is larger than that at the lower end of the piston, the piston 20 is tightly abutted against the valve port 11, sealing of the main valve port 111 is achieved, and circulation between the first connecting pipe 12 and the second connecting pipe 13 is cut off.
Because in the working process of the existing electromagnetic valve, due to the elastic force of the first spring, in the process of turning the high-pressure refrigerant from the second connecting pipe to the first connecting pipe, the first spring is easily pushed to the center of the valve port part along the direction perpendicular to the axial line of the valve body due to the impact of the high-pressure refrigerant, so that the piston is likely to be pressed on the first spring when abutting against the valve port part, the sealing performance of the main valve port is affected, and leakage is caused.
In order to solve the above problem, it is necessary to reduce the elastic force of the first spring 30 and increase the rigidity of the first spring 30. In addition to the above-mentioned manner of designing the length of the first spring 30, it is also possible to increase the height of the valve port portion 11, shorten the distance between the piston 20 and the valve port portion 11, perform partial pressure compensation on the first spring 30, and the like, and reduce the effective number of turns of the first spring 30.
As shown in FIGS. 3 and 4, the valve body 10 has a valve port 11 with a height H in the axial direction1And H is1Satisfy the relation H11.8mm-2.4 mm. That is, the installation height H of the valve port 111And may be 1.8mm, 2.0mm, 2.2mm, 2.4mm, and any number falling within the range of values, without limitation. The setting height of the valve port 11 cannot be too low, which may affect the sealing performance of the piston 20 against the valve port 11; the setting height of the valve port portion 11 must not be so high that there is no space for the piston 20 to move.
Note that the valve port 11 is set to have a height H1Satisfy the relation H11.8mm-2.4mm, so that the height of the valve port part 11 is increased to block the trend of the first spring 30 moving towards the middle of the valve port part 11 to a certain extent, and further avoid bad valve closing.
Further, the piston 20 comprises a guiding section 21. The first spring 30 is connected to the guide section 21 near one end of the piston 20, and the guide section 21 is set to a height H along the axial direction of the valve body 102And H is2Satisfy the relation H21.5mm-2.2 mm. That is, the height H of the guide section 212And may be 1.5mm, 1.8mm, 2.0mm, 2.2mm, and any number falling within the range of values, without limitation. The setting height of the guide section 21 cannot be too low, and the connection firmness between the piston 20 and the first spring 30 is affected if the setting height is too low; the height of the guide section 21 should not be too high, which would increase unnecessary costs.
It should be noted that the height H of the guide section 21 is set2Satisfy the relation H21.8mm-2.4mm, so that the height of the guide section 21 is increased to shorten the distance between the piston 20 and the valve port 11 when the valve is opened, and the first spring 30 is blocked from moving towards the middle of the valve port 11, thereby avoiding the generation of the phenomenonThe valve is not closed well.
Further, the first spring 30 includes a first connection section 31 and a second connection section 32, the first connection section 31 is sleeved on and connected to the guide section 21, the second connection section 32 is sleeved on and connected to the valve opening 11, and the first connection section 31 and the second connection section 32 are pressure-equalized and disposed.
It should be noted that, by pressing and arranging the first connecting section 31 and the second connecting section 32, the elasticity of the first spring 30 is further reduced, the stiffness of the first spring 30 is increased, and then the tendency of the first spring 30 to move towards the middle of the valve opening 11 is reduced, so as to avoid bad valve closing.
Further, the number of effective turns of the first spring 30 is N, and N satisfies the relation N-2-4 turns. That is, the number of effective turns N of the first spring 30 may be 2 turns, 3 turns, and 4 turns, which is not limited herein. The number of effective turns of the first spring 30 cannot be too small, and too small results in too low elastic force of the first spring 30, and the piston 20 is not easy to move in the valve body 10; the effective number of turns of the first spring 30 cannot be too large, and the too large spring increases the elastic force of the first spring 30, so that the problem of poor valve closing caused by the movement of the first spring 30 towards the middle of the valve opening 11 cannot be solved.
It should be noted that, N satisfies the relation N-2-4 circles, so that the elasticity of the first spring 30 is further reduced, the stiffness of the first spring 30 is increased, the tendency of the first spring 30 to move toward the middle of the valve opening 11 is further reduced, and the valve closing failure is avoided.
The utility model also provides a technical scheme that:
an air conditioning system includes a solenoid valve 100. The air conditioning system also has the same advantages as the solenoid valve 100 described above.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An electromagnetic valve comprises a valve body (10) and a piston (20), wherein a valve port part (11) is arranged on the valve body (10), and the piston (20) can move along the axial direction of the valve body (10) and is abutted against the valve port part (11);
the valve is characterized in that a first spring (30) is connected between the piston (20) and the valve opening portion (11), two ends of the first spring (30) are respectively sleeved on the piston (20) and the valve opening portion (11), the piston (20) comprises a guide section (21), one end of the first spring (30) is close to the piston (20) and is connected onto the guide section (21), and the guide section (21) is sleeved with the first spring (30) and is L-shaped in length1The length of the first spring (30) sleeved on the valve opening part (11) is L2The total length of the first spring (30) in a fully compressed state is L4(ii) a The first spring (30) has a total length L when the piston (20) is in the upper limit movement position3And L is1、L2、L3And L4The following relation is satisfied:
L3-L1＜L4and/or, L3-L2＜L4。
2. The electromagnetic valve according to claim 1, characterized in that the valve mouth (11) is provided at a height H in the axial direction of the valve body (10)1And H is1The following relation is satisfied:
H1＝1.8mm-2.4mm。
3. the solenoid valve of claim 1 wherein the rimThe axial direction of the valve body (10) and the setting height of the guide section (21) are H2And H is2The following relation is satisfied:
H2＝1.5mm-2.2mm。
4. a solenoid valve according to claim 3, characterised in that said first spring (30) comprises a first connecting section (31), said first connecting section (31) being connected to said guide section (21), and said first connecting section (31) being pressed and set.
5. The solenoid valve according to claim 1, characterized in that said first spring (30) comprises a second connection section (32), said second connection section (32) being connected to said valve mouth (11), and said second connection section (32) being pressed and set.
6. The solenoid valve according to claim 1, characterized in that the first spring (30) has an effective number of turns of N, and N satisfies the following relation:
n-2-4 turns.
7. The electromagnetic valve according to claim 1, characterized in that a first connecting pipe (12) and a second connecting pipe (13) are connected to the valve body (10), the axis of the first connecting pipe (12) is perpendicular to the axis of the valve body (10), the first connecting pipe (12) is connected to the side of the valve body (10), the second connecting pipe (13) extends along the axis of the valve body (10), and the second connecting pipe (13) is connected to the end of the valve body (10);
the first adapter tube (12) and the second adapter tube (13) communicate with each other as the piston (20) is detached from the valve port portion (11).
8. The solenoid valve according to claim 7, characterized in that the solenoid valve further comprises a sleeve (40) and a plunger assembly (41), the sleeve (40) is hermetically mounted at one end of the valve body (10) far away from the second adapter (13), the plunger assembly (41) is arranged in the sleeve (40), and the plunger assembly (41) can move in the sleeve (40) along the axial direction of the valve body (10);
one end of the piston (20) close to the movable iron core assembly (41) is provided with a valve guide port (22), and the movable iron core assembly (41) can move towards the valve guide port (22) and is abutted to the valve guide port (22).
9. The solenoid valve according to claim 8, characterized in that the solenoid valve further comprises a control assembly (50), the control assembly (50) comprises a coil, a stationary core (51) and a second spring (52), the coil is installed outside the sleeve (40), the stationary core (51) and the second spring (52) are both disposed inside the sleeve (40), the stationary core (51) is fixed at one end of the sleeve (40) far away from the valve body (10), one end of the second spring (52) abuts against the stationary core (51), and the other end abuts against the movable core assembly (41);
the movable iron core assembly (41) can move towards a direction close to the static iron core (51) under the control of the coil, and can move towards a direction far away from the static iron core (51) under the action of elastic force of the second spring (52).
10. Air conditioning system, characterized in that it comprises a solenoid valve according to one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122837546.0U CN216112428U (en) | 2021-11-18 | 2021-11-18 | Electromagnetic valve and air conditioning system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122837546.0U CN216112428U (en) | 2021-11-18 | 2021-11-18 | Electromagnetic valve and air conditioning system with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216112428U true CN216112428U (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122837546.0U Active CN216112428U (en) | 2021-11-18 | 2021-11-18 | Electromagnetic valve and air conditioning system with same |
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| Country | Link |
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| CN (1) | CN216112428U (en) |
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2021
- 2021-11-18 CN CN202122837546.0U patent/CN216112428U/en active Active
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